西批农林升枚大学 IVERS 3.Damage All 3 species are polyphagous,but Macrosiphum avenae mainly damage wheat;Schizaphis graminum feed mainly on wheat and sorghum;Rhopalosiphum padi,on wheat and maize. 88888
All 3 species are polyphagous, but Macrosiphum avenae mainly damage wheat; Schizaphis graminum feed mainly on wheat and sorghum; Rhopalosiphum padi, on wheat and maize. 3. Damage
西北农林升枚大学 4.Life Cycle NORTHWEST A&F U时VERSITY 1)Wheat Aphids Cereal crop aphids have both holocyclic life cycles and anholocyclic life cycles. >Holocyclic life cycles in northern cold areas;anholocyclic life cycles in southern warm areas. 10-20 generations annually;number 888880 varies with the wheat planting areas
1) Wheat Aphids Cereal crop aphids have both holocyclic life cycles and anholocyclic life cycles. Holocyclic life cycles in northern cold areas; anholocyclic life cycles in southern warm areas. 10-20 generations annually; number varies with the wheat planting areas 4. Life Cycle
品北农林升枚大学 NORTHW国图T A&F UNIV到RsIT型 English grain aphid is a migratory pest.Northern limit is located at 26- 27 N.There are no overwintering aphids in northern China in winter. 888880
English grain aphid is a migratory pest. Northern limit is located at 26- 27 °N. There are no overwintering aphids in northern China in winter
西北农林升枚大学 NORTHWEST A&F U时VERSITY Greenbug has either an anholocyclic life cycle in mid-southern China or an autoecious holocyclic life cycle in northern China.Eggs overwinter on wheat seedlings. 88880
Greenbug has either an anholocyclic life cycle in mid-southern China or an autoecious holocyclic life cycle in northern China. Eggs overwinter on wheat seedlings